さきに
before, ahead
You are off now and they can catch up. By the time they are through the door you have the sake さき poured and your coat off: さきに.
お先に失礼します is the standard line for leaving the office before your colleagues.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.